ZHCSG01C February 2017 – August 2018 DRV8320 , DRV8320R , DRV8323 , DRV8323R
PRODUCTION DATA.
- 1 特性
- 2 應用
- 3 說明
- 4 修訂歷史記錄
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3
Feature Description
- 8.3.1 Three Phase Smart Gate Drivers
- 8.3.2 DVDD Linear Voltage Regulator
- 8.3.3 Pin Diagrams
- 8.3.4 Low-Side Current Sense Amplifiers (DRV8323 and DRV8323R Only)
- 8.3.5 Step-Down Buck Regulator
- 8.3.6 Gate Driver Protective Circuits
- 8.4 Device Functional Modes
- 8.5 Programming
- 8.6
Register Maps
- Table 1. DRV832xS and DRV832xRS Register Map
- 8.6.1 Status Registers
- 8.6.2 Control Registers
-
9 Application and Implementation
- 9.1 Application Information
- 9.2
Typical Application
- 9.2.1
Primary Application
- 9.2.1.1 Design Requirements
- 9.2.1.2 Detailed Design Procedure
- 9.2.1.3 Application Curves
- 9.2.2 Alternative Application
- 9.2.1
Primary Application
- 10Power Supply Recommendations
- 11Layout
- 12器件和文檔支持
- 13機械、封裝和可訂購信息
8.3.4.4 MOSFET VDS Sense Mode (SPI Only)
The current sense amplifiers on the DRV8323 and DRV8323R SPI devices can be configured to amplify the voltage across the external low-side MOSFET VDS. This configuration lets the external controller measure the voltage drop across the MOSFET RDS(on) without the shunt resistor and then calculate the half-bridge current level.
To enable this mode set the CSA_FET bit to 1. The positive input of the amplifier is then internally connected to the SHx pin with an internal clamp to prevent high voltage on the SHx pin from damaging the sense amplifier inputs. During this mode of operation, the SPx pins should stay disconnected. When the CSA_FET bit is set to 1, the negative reference for the low-side VDS monitor is automatically set to the SNx pin, regardless of the state of the state of the LS_REF bit. This setting is implemented to prevent disabling of the low-side VDS monitor.
If the system operates in MOSFET VDS current sense mode, route the SHx and SNx pins with Kelvin connections across the drain and source of the external low-side MOSFETs.
Figure 41. Resistor Sense Configuration 
Figure 42. VDS Current Sense Mode When operating in MOSFET VDS current sense mode, the amplifier is enabled at the end of the tDRIVE time. At this time, the amplifier input is connected to the SHx pin, and the SOx output is valid. When the low-side MOSFET receives a signal to turn off, the amplifier inputs, SPx and SNx, are shorted together internally.